package com.zx.reggie.controller;

import com.zx.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.util.UUID;

/**
 * @author 张旭
 * @version 1.0
 */
@RestController
@Slf4j
@RequestMapping("/common")
public class CommonController {

    //获取yml中的自定义变量
    @Value("${reggie.path}")
    private String basePath;


    @PostMapping("/upload")
    public R<String> upload(MultipartFile file) {
        //file是一个临时文件，需要转存到指定位置，否则本次请求完成后临时文件会删除
        log.info(file.toString());

        //原始文件名
        String originalFilename = file.getOriginalFilename();
        String suffix = originalFilename.substring(originalFilename.lastIndexOf("."));

        //使用UUID重新生成文件名，防止文件名称重复造成文件覆盖
        String fileName = UUID.randomUUID().toString() + suffix;//dfsdfdfd.jpg

        File dir = new File(basePath);
        if (!dir.exists()) {
            dir.mkdirs();
        }
        try {
            file.transferTo(new File(basePath + fileName));
        } catch (IOException e) {
            e.printStackTrace();
        }
        return R.success(fileName);
    }

    @GetMapping("/download")
    public void download(String name, HttpServletResponse response) throws IOException {

        FileInputStream inputStream = new FileInputStream(new File(basePath + name));

        ServletOutputStream outputStream = response.getOutputStream();
        response.setContentType("image/jpeg");

        int len = 0;
        byte[] bytes = new byte[1024];

        while ((len = inputStream.read(bytes))!= -1){
            outputStream.write(bytes,0,len);
            outputStream.flush();
        }
        outputStream.close();
        inputStream.close();
    }
}
